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use crate::{Echo, View, WelfordOnline};
#[derive(Clone)]
pub struct VSCT<V> {
view: V,
welford_online: WelfordOnline<Echo>,
last: f64,
}
impl<V> std::fmt::Debug for VSCT<V> {
fn fmt(&self, fmt: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
write!(fmt, "VSCT.last: {}", self.last)
}
}
impl<V> VSCT<V>
where
V: View,
{
#[inline]
pub fn new(view: V, window_len: usize) -> Self {
VSCT {
view,
welford_online: WelfordOnline::new(Echo::new(), window_len),
last: 0.0,
}
}
}
impl<V> View for VSCT<V>
where
V: View,
{
fn update(&mut self, val: f64) {
self.view.update(val);
let val = self.view.last();
self.welford_online.update(val);
self.last = val;
}
fn last(&self) -> f64 {
let std_dev = self.welford_online.last();
if std_dev == 0.0 {
return 0.0;
}
let mean = self.welford_online.mean();
(self.last - mean) / std_dev
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::plot::plot_values;
use crate::test_data::TEST_DATA;
#[test]
fn vsct_plot() {
let mut vsct = VSCT::new(Echo::new(), 16);
let mut out: Vec<f64> = Vec::with_capacity(TEST_DATA.len());
for v in &TEST_DATA {
vsct.update(*v);
out.push(vsct.last());
}
let filename = "img/vsct.png";
plot_values(out, filename).unwrap();
}
}